Reversing mechanism for engines



(No Model.) .3 sheetssheet 1.

J. W. STRINGER. REVER$ING MECHANISM EOE ENGINES.

No. 400,805. Patented Apr. 2, 1889.

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(No Model.) 3 SheetsSheet 2..

J. W. S TEINGER. REVERSIN G MECHANISM FOR ENGINES.

No. 400,805. Patented Apr. 2, 1 889.

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(No Model.) 3 Sheets-Sheet 3..

J. W. STRINGER.

REVERSING MECHANISM FOR ENGINES. No. 400,805. -Pa;te.ntedA pr. 2, 1889..

A T T ORNE K! N. PETERS, Pinto-Lithographer. Washinglon, mc.

LUNIITED STATES ATENT OFFICE.

JOHN WfsTRINeER, or MARION, OHIO.

REVERSING MECHANISM FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 400,805, dated April 2, 1889.

Application filed November 5, 1888. Serial No. 289,989. (No model.) 7

To all whom it may concern:

Be it known that 1, JOHN W. STRINGER, of Marion, in the county of Marion and State of Ohio, have invented certain new and useful Improvements in Reversing Mechanism for Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in reversing mechanism for steam-engines, in which the eccentric consists of a disk that is shifted to eccentric positions on opposite sides of the engine-shaft, the shifting mechanism in part consisting'of link and crank thatwith each throw pass a trifle their dead-centers, and thereby block the eccentrics in working positions, and in the main relieving the shifting mechanism from all strain, wear, and tear in operating the engine.

In the accompanying drawings, Figure 1 is a side elevation with the shifting-block removed. Fig. 2 is a side elevation of shiftingblock detached. Fig. 3 is a side elevation of the eccentric detached. Fig. 4 is a section on lines as 00, Figs. 1 and 2. Fig. 5 is an elevation in section on line y y, Fig. 1. Fig. 6 is an elevation of the eccentric-hub detached. Fig. 7 is a diagrammatic plan showing the different extreme positions of the crank and link that shift the eccentric disk.

A represents the engine-shaft, on which is mounted and rigidly secured the hub B for shifting the eccentric disk (J. The hub has arm B extending laterally in opposite directions, the edges of these arms at 1) serving as ways for disk 0 to reciprocate on. The eccentric disk is provided with gibs c and c for embracing way I), and the central portion of the eccentric disk is cut away to allow a limited movement of the disk on way 1) without the disk colliding with the shaft A.

At the one side of hub B is journaled shaft D, the hub having attached-cap B the latter forming the one member of such j ournal-box. The cap has an integral iic nge, b, extending laterally and operating between gib c and the opposing side of the eccentric, to prevent the parts from rocking, flange I) having a slot, Z2 for the passage of bolt 0 for holding the central disk becomes sutflciently eccentric with shaft A and in the direction to run the engine forward. By reversing shaft B a half-revolution disk 0 becomes eccentric on the opposite side of shaft A, whereby the engine is run backward. The outer section of shaft D has spiral flutings d, similar to the fluting of the twist-drill.

E is a sleeve fitting easily on shaft A, such sleeve having alongitudinal bore with a spiral trend adapted to fit the spiral section of shaft D.- The sleeve has also a straight bore adapted to fit steady-pin F, the latter being rigidly connected with hub B, the steady-pin projecting parallel with shafts A and D. By reciprocating sleeve E endwise shaft D is turned a half-revolution alternately in opposite directions. Sleeve E has an annular flange, e, that is embraced by the two sections G and G of a loose collar. (See Fig. 4..) Section G of the collar has ears g, to which is pivoted at h the prongs H of a forked shiftinglever of the bell-crank variety, such lever and the general arrangement of the same being substantially the same as heretoforeused for such purpose. The throw or end movement of sleeve E is sufficient to give shaft D a trifle more than ahalf-turn in either direction, and consequently link 0 and crank D turn a trifle past their dead-centers with each throw of the sleeve (see Fig. 7) and block the eccentric disk 0, so that it cannot reverse except shaft D is reversed, thus relieving the shifting mechanism in the main of all strain and wear and tear and friction in working the engine, except during the actual time of shifting.

Fingers I are fastened by screws 1 to opposite sides of hub B. These fingers extend through holes b in arm B. The free ends 1' of these fingers respectively engage lug c of eccentric disk 0, such engagement serving not only as stops to limit the movement of disk 0 in either direction, but serving more especially as blocking in opposition to the link and crank, whereby lost motion is avoided in the throw of the eccentric, and the link and crank have only to hold disk G in the one direction While the disk in its respective position for running the engine forward or backward.

\Vhat I claim is 1. The combination, with shifting eccentric disk for reversing the engine, of crank and connecting-link for shifting such eccentric disk, the position of link and crank past their dead-centers being utilized in looking the occentric disk in its WOl'kll] g position, substantially as set forth.

2. The col'nbination,with shifting eccentric disk and crank and link for operating the same, the position oi the link and crank past their dead-centers being utilized in locking the occentric disk in its working position, of crankshaft having spiral flutings or grooves, and a sliding block for engaging and rotating such shaft byreciproeations of the block, the parts being arranged substantially as set forth.

The combination, with a hub mounted on the engine-shaft and provided with ways 

